<template>
  <!-- 商品分类导航 -->
        <div class="type-nav">
            <div class="container">
                <div class="nav-left" @mouseleave="leaveHandler">
                    <h2 class="all" @mouseenter="isShowNav = true">全部商品分类</h2>
                        <div class="sort" v-show="isShowNav">
                    <div class="all-sort-list2" @click='btnSearch'>
                                                            <!-- 数据多了两项，切割一下 -->
                        <div class="item" v-for="c1 in categoryList.slice(0,-2)" :key="c1.categoryId">
                            <h3>
                                <!-- 定义自定义属性，data-level='1'几级菜单  :data-id标识符   :data-name名字  -->
                                <a href="javascript:;" data-level='1' :data-id='c1.categoryId' :data-name='c1.categoryName'>{{c1.categoryName}}</a>
                            </h3>
                            <div class="item-list clearfix" v-for="c2 in c1.categoryChild" :key='c2.categoryId'>
                                <div class="subitem">
                                    <dl class="fore">
                                        <dt>
                                            <a href="javascript:;" data-level='2' :data-id='c2.categoryId' :data-name='c2.categoryName'>{{c2.categoryName}}</a>
                                        </dt>
                                        <dd>
                                            <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                                                <a href="javascript:;" data-level='3' :data-id='c3.categoryId' :data-name='c3.categoryName'>{{c3.categoryName}}</a>
                                            </em>
                                        </dd>
                                    </dl>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
			</div>
                <nav class="nav">
                    <a href="###">服装城</a>
                    <a href="###">美妆馆</a>
                    <a href="###">尚品汇超市</a>
                    <a href="###">全球购</a>
                    <a href="###">闪购</a>
                    <a href="###">团购</a>
                    <a href="###">有趣</a>
                    <a href="###">秒杀</a>
                </nav>
            </div>
        </div>
</template>

<script>
import {mapState} from 'vuex'//为了使用数据方便使用映射的方式
export default {
    name:'TypeNav',
    data(){
        return{
            isShowNav:false
        }
    },
    computed:{
        //         拿数据遍历渲染
    ...mapState('home',['categoryList'])
    },
    methods:{
        //事件委托：点击事件
        btnSearch(e){
            // console.log(this.$route);
        //dataset是获取所有自定义属性{level: '1', id: '2', name: '手机'}
            // console.log(e.target.dataset);
            // 获取传递的数据
            const {level, id, name} = e.target.dataset
            // 如果level没有值就说明点击的不是a链接，而是区域外，就不要向下执行了
            if (!level) return
            let {keyword} = this.$route.query
            //编程式导航
            this.$router.push({
                name:'search',
                query: {
                ['category' + level + 'Id']: id,
                categoryName: name,
                keyword
                }
            }) 
        },
        //鼠标离开三级导航页面隐藏
        leaveHandler(){
            if (!this.$route.meta.isHiddenNav) {
                this.isShowNav = false
            }

        }
    },
    mounted(){
    // 发送请求 获取对应的数据
    //     reqCategoryListData().then(
    //         result=>console.log(result),
    //         error=>console.log(error.message))
    // this.$store.dispatch('getCategoryList')
    // 一开始要判断一下是显示还是隐藏
        if (this.$route.meta.isHiddenNav) {
            this.isShowNav = true
        }
    }



}
</script>

<style lang='less' scoped>
.type-nav {
        border-bottom: 2px solid #e1251b;

        .container {
            width: 1200px;
            margin: 0 auto;
            display: flex;
            position: relative;

            .all {
                width: 210px;
                height: 45px;
                background-color: #e1251b;
                line-height: 45px;
                text-align: center;
                color: #fff;
                font-size: 14px;
                font-weight: bold;
            }

            .nav {
                a {
                    height: 45px;
                    margin: 0 22px;
                    line-height: 45px;
                    font-size: 16px;
                    color: #333;
                }
            }

            .sort {
                position: absolute;
                left: 0;
                top: 45px;
                width: 210px;
                height: 461px;
                position: absolute;
                background: #fafafa;
                z-index: 999;

                .all-sort-list2 {
                    .item {
                        h3 {
                            line-height: 30px;
                            font-size: 14px;
                            font-weight: 400;
                            overflow: hidden;
                            padding: 0 20px;
                            margin: 0;

                            a {
                                color: #333;
                            }
                        }

                        .item-list {
                            display: none;
                            position: absolute;
                            width: 734px;
                            min-height: 460px;
                            background: #f7f7f7;
                            left: 210px;
                            border: 1px solid #ddd;
                            top: 0;
                            z-index: 9999 !important;

                            .subitem {
                                float: left;
                                width: 650px;
                                padding: 0 4px 0 8px;

                                dl {
                                    border-top: 1px solid #eee;
                                    padding: 6px 0;
                                    overflow: hidden;
                                    zoom: 1;

                                    &.fore {
                                        border-top: 0;
                                    }

                                    dt {
                                        float: left;
                                        width: 54px;
                                        line-height: 22px;
                                        text-align: right;
                                        padding: 3px 6px 0 0;
                                        font-weight: 700;
                                    }

                                    dd {
                                        float: left;
                                        width: 415px;
                                        padding: 3px 0 0;
                                        overflow: hidden;

                                        em {
                                            float: left;
                                            height: 14px;
                                            line-height: 14px;
                                            padding: 0 8px;
                                            margin-top: 5px;
                                            border-left: 1px solid #ccc;
                                        }
                                    }
                                }
                            }
                        }

                        &:hover {
                            .item-list {
                                display: block;
                            }
                        }
                    }
                }
            }
        }
    }
</style>